Cuba is not cut off from "everything", though their massive media campaign has made it appear so.

There's flights from the US to Cuba now.

You could say, ban any airline that flights to Russia from flying into EU/US, heck, do it on an airplane basis to avoid shell companies and such. Any airplane that touches Russian soil, banned from ever entering any US/EU airspace/soil ever again.

No, I mean the stand off, where Soviet ships in transit to Cuba, were blockaded by US warships, almost starting WWIII.

And, with China being blocked off, talk about pushing two allies even closer together. Who needs 'the west'?